The "Gang of Eight" senators penning a comprehensive immigration reform bill, meanwhile, will present their proposals next week, ahead of an April 17 hearing

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Adita Chicas, left, and her son Jessy Chicas, 10, of Woodbridge, Va., cheer as they arrive at the "Rally for Citizenship" on Capitol, Hill in Washington, Wednesday, April 10, 2013, where tens of thousands of immigrants and their supporters are expected to rally for immigration reform. Bipartisan groups in the House and Senate are said to be completing immigration bills that include a pathway to citizenship for the nation's 11 million immigrants with illegal status. (AP Photo/Jacquelyn Martin)

Updated at 7:28 PM EDT on Wednesday, Apr 10, 2013

Tens of thousands of immigrants and activists rallied nationwide Wednesday in a coordinated set of protests aimed at pressing Congress to approve immigration measures that would grant 11 million immigrants living here illegally a path toward citizenship.

Their gatherings came as the "Gang of Eight" senators came close to finishing their work on a comprehensive immigration bill they plan to present next week.

Senate Judiciary Committee Chairman Patrick Leahy said Wednesday that he had scheduled an April 17 hearing on the proposals, with Homeland Security Secretary Janet Napolitano will testify. That means the mark-up on the bill will begin in May — which some in the GOP said was too soon.

Organizers said demonstrations were taking place in at least 18 states and in Washington, D.C., where a large, festive crowd gathered on the west lawn of the U.S. Capitol Wednesday afternoon. Many carried hand-lettered signs and chanted "Si, se puede," Spanish for "Yes, we can."

"We won't win immigration reform just coming to Washington. We need to walk the streets all over the country," said Ben Monterroso, national director of civic participation of the Service Employees International Union, which represents nurses and lower-wage employees including janitors and child care workers.

In Atlanta, more than 1,000 people marched around the Georgia Capitol Wednesday midday, calling for comprehensive changes to immigration policy and an end to deportation.

Supporters massed in several rallies in New York City, including in the Washington Heights section, as well as in Queens, Manhattan and The Bronx.

In San Francisco, demonstrators planned to build an altar at the federal building with 1,000 paper flowers, symbolizing the number of people deported daily for immigration violations. In San Diego, about 50 demonstrators gathered on a sidewalk outside the office of U.S. Sen. Dianne Feinstein, a sharp contrast to massive protests in 2006 when thousands of demonstrators shut down downtown streets to support looser immigration policies.

Senators writing a sweeping immigration bill have said they hope to finish their work this week, opening what's sure to be a raucous public debate over measures to secure the border, allow tens of thousands of foreign workers into the country and grant eventual citizenship to the millions living illegally in the United States.

A person familiar with proposed bipartisan immigration legislation being written in the Senate said Wednesday the bill would require greatly expanded surveillance of the U.S. border with Mexico and greatly increased detention of border crossers in high-risk areas. The person provided the information on condition of anonymity because the deliberations were private.

Groups opposed to illegal immigration say they aren't worried that lawmakers or voters will be swayed by emotional messages, and argue that extending legal rights to immigrants living illegally in the U.S. will create financial problems for cash-starved governments and spur more illegal immigration.

"There ought to be a rally for the 20 million Americans who can't find a full-time job," NumbersUSA President Roy Beck, whose group advocates reductions in immigration levels, said in a statement Wednesday.

Immigration rights activists said the size of their movement would be on display at rallies around the country, including in the nation's capital, where National Association for the Advancement of Colored People President Benjamin Jealous delivered the keynote address.

Gustavo Andrade, who leads a large immigrant advocacy group in Maryland and helped organize Wednesday's event, said about 400 buses carrying activists converged on Washington for the rally.

The activists already claim victories nationwide, including a successful lobbying effort against a plan in North Carolina to provide driver's licenses to immigrants with the words: "NO LAWFUL STATUS."

The immigrant activism movement gained national attention in 2007 when President George W. Bush and a bipartisan group of lawmakers unsuccessfully tried comprehensive immigration overhaul. Some high school and college students who were brought to the U.S. as young children began living openly and holding rallies.

The movement gained new supporters in 2010, when Congress debated but did not pass the DREAM Act — legislation that would have granted legal status to young immigrants living illegally in the country.

President Barack Obama announced in June his deferred-deportation program allowing young immigrants to apply for work visas. During his State of Union address in February, Obama called on Congress to quickly pass sweeping immigration measures.